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    <title>Document</title>
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    <script>
        // for in 循环遍历对象
        var obj = {
            name: "张三",
            age: 15
        }
        for (var key in obj) {
            // key 代表键名
            // obj[key] 键值
            console.log(key,obj[key])
        }s

    </script>
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